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Hidden on-shell mediators for the Galactic Center<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-ray excess
We present simplified models for the galactic center $\ensuremath{\gamma}$-ray excess where Dirac dark matter annihilates into pairs or triplets of on-shell bosonic mediators to the standard model. These annihilation modes allow the dark matter mass to be heavier than those of conventional effective theories for the $\ensuremath{\gamma}$-ray excess. Because the …